Collared prosthetic device with centering fins

A femoral component for use in a total hip replacement, said component being adapted to be inserted into a femoral cavity formed in a proximal end of the femur, said component comprising:

• a stem structured to fit into the cavity formed in the proximal end of the femur, said stem having a proximal end and a medial surface;
• a collar disposed on said proximal end of said stem and extending at least from said medial surface of said stem, said collar having a lower surface adapted to rest in contact with a surface on the proximal end of the femur;
• and
• a structure disposed on said lower surface of said collar, said structure comprising:
• a first fin having a proximal end and a distal end;
• a second fin having a proximal end and a distal end, said first and said second fins forming an angle with respect to one another, said distal end of said first fin and said distal end of said second fin extending away from said medial surface of said stem;
• a web interconnecting said proximal end of said first fin with said proximal end of said second fin, said web being disposed in abutting relation with said medial surface of said stem;
• and
• a peg disposed adjacent said distal end of each of said first and said second fins, each of said pegs being disposed in a friction fit with an opening formed on said lower surface of said collar.

A femoral component for use in a total hip replacement, said component being adapted to be inserted into a femoral cavity formed in a proximal end of the femur, said component comprising:

• an elongated stem adapted to fit into the cavity formed in the proximal end of the femur, said stem having a proximal end and a medial surface;
• a collar disposed on said proximal end of said stem and extending at least from the medial surface in a direction generally transverse of a direction of elongation of said stem, said collar having a lower surface adapted to rest in contact with a surface on the proximal end of the femur, said lower surface of said collar having elongated slots disposed thereon;
• and
• a structure disposed on said lower surface of said collar, said structure being disposed only beyond said medial surface of said stem and comprising at least two fins disposed at an angle with respect to one another and interconnected by a web, said fins being structured to extend into a recess formed in the proximal end of the femur, each of said fins including a peg which is disposed within an associated slot disposed on said lower surface of said collar, said fins being formed of a resilient material which urges said pegs in said slots toward one another and away from outer edges of said collar.

A femoral component for use in a total hip replacement, said component being adapted to be inserted into a femoral cavity formed in a proximal end of the femur, said component comprising:

• a stem structured to fit into the cavity formed in the proximal end of the femur, said stem having a proximal end and a medial surface;
• a collar disposed on said proximal end of said stem and extending at least from said medial surface of said stem, said collar having a lower surface adapted to rest in contact with a surface on the proximal end of the femur;
• and
• a structure disposed on said lower surface of said collar, said structure being formed of a resilient material and comprising:
• a first fin having a proximal end and a distal end;
• a second fin having a proximal end and a distal end, said first and said second fins forming an angle with respect to one another;
• a web interconnecting said proximal end of said first fin with said proximal end of said second fin, said web being disposed in abutting relation with said medial surface of said stem;
• and
• a peg disposed adjacent said distal end of each of said first and said second fins, each of said pegs being disposed in a friction fit with an elongated slot formed on said lower surface of said collar and extending from an associated edge of said collar inwardly toward the other one of said slots, each of said pegs riding in one of said slots and being biased inwardly away from its associated edge of said collar.

A prosthetic component for use in a joint replacement, said prosthetic component being adapted to be inserted into a cavity formed in a proximal end of a bone, said component comprising:

• an elongated stem adapted to fit into the cavity formed in the proximal end of the bone, said stem having a proximal end and a medial surface;
• a collar disposed on said proximal end of said stem and extending at least from the medial surface in a direction generally transverse of a direction of elongation of said stem, said collar having a lower surface adapted to rest in contact with a surface on the proximal end of the bone;
• and
• a structure disposed on said lower surface of said collar, said structure being disposed only beyond said medial surface of said stem and comprising at least two fins disposed at an angle with respect to one another and extending away from said medial surface of said stem, said fins being interconnected by a web, said fins being structured to extend into a recess formed in the proximal end of the bone.

A prosthetic component for use in a joint replacement, said component being adapted to be inserted into a cavity formed in a proximal end of a bone, said component comprising:

• a stem structured to fit into the cavity formed in the proximal end of the bone, said stem having a proximal end and a medial surface;
• a collar disposed on said proximal end of said stem and extending at least from said medial surface of said stem, said collar having a lower surface adapted to rest in contact with a surface on the proximal end of the bone;
• and
• a structure disposed on said lower surface of said collar, said structure comprising:
• a first fin having a proximal end and a distal end;
• a second fin having a proximal end and a distal end, said first and said second fins forming an angle with respect to one another, said distal end of said first fin and said distal end of said second fin extending away from said medial surface of said stem;
• a web interconnecting said proximal end of said first fin with said proximal end of said second fin, said web being disposed in abutting relation with said medial surface of said stem;
• and
• a peg disposed adjacent said distal end of each of said first and said second fins, each of said pegs being disposed in a friction fit with an opening formed on said lower surface of said collar.